Analyze cache content

TrueNAS General
2

Well, the extreme list is:
arc_summary
but that spews out lots of stuff.

Probably want these numbers, (from my desktop that does not have a L2ARC / Cache device):

ARC misc:
...
        L2 cached evictions:                                     0 Bytes
        L2 eligible evictions:                                  16.9 GiB
        L2 eligible MFU evictions:                     12.9 %    2.2 GiB
        L2 eligible MRU evictions:                     87.1 %   14.7 GiB
        L2 ineligible evictions:                               144.1 MiB

And these tunables:

Tunables:
...
        l2arc_exclude_special                                          0
        l2arc_feed_again                                               1
        l2arc_feed_min_ms                                            200
        l2arc_feed_secs                                                1
        l2arc_headroom                                                 8
        l2arc_headroom_boost                                         200
        l2arc_meta_percent                                            33
        l2arc_mfuonly                                                  0
        l2arc_noprefetch                                               1
        l2arc_norw                                                     0
        l2arc_rebuild_blocks_min_l2size                       1073741824
        l2arc_rebuild_enabled                                          1
        l2arc_trim_ahead                                               0
        l2arc_write_boost                                       33554432
        l2arc_write_max                                         33554432
Last, developers have been working on the L2ARC / Cache software a bit. Some of the more recent changes may help cache more information. See this thread, (which unfortunately goes off topic a few times);